Raymond Hettinger added the comment: Yes, I saw that. If a function could raise a NoCache exception, re._compile() could take advantage of it. But I don't feel good about going down that path (adding coupling between the caching decorator and the cached function). It would be better to keep the lru_cache API simple. I already made the mistake of expanding the API for typed=True just to accommodate a single use case (re.compile).
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